Telephone-exchange system.



H. P. CLAUSEN.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED 02c. 13. 1916.

1 ,272,221. v Patented July 9, 1918. LE [H u E I. 23 Q E, 11 Q, J a,

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UNITED STATES [PATENT ewes HEN Y' P. oLAUsEN, or MOUNT vERNoN, NEW YORK,AssIGNoR T WESTERN ELECTRIC coMrAN INCORPORATED, on NEW YORK, N. Y., A-ooRro A'rIo on NEW YO K.-

TELEPHONE-EXCHANGE: sYsTEM.

To all whom it may concern:

Be it=known that I,,H NRY P. CLAUSEN, a citizen of the United States,residing at Mount Vernon, in .the county of' WVestches ter and State ofNew York, have invented certain new and useful Improvements inTelephoneExchange Systems, of which the.

following is a full, clear, concise, and exact (lQSC11pl31011.- y Thisinventlon relates to telephone exchange systems, and more particularlyto vention,apparatus is provided at the originating oiiice by means ofwhich the originatmg operator may determine. which of two,

subscribers on a line to which theother end of a trunk circuit isconnected, is signaled.

In accordance with another .feature of this invention, the trunk circuitis provided with a signaling device associated with the. incom ng endthereof and operatlng when a l nk. circuit s connected withv the outgong end thereof to furnish a signal and operating intermittently upon thesubsequent dis: connection of the link circuit from the outgoing endofthetrunk, while the incoming end is connected with the telephone line,the receiver of which is off the switchhook. 'This invention isillustrated in the accompanyingdrawings, in which a a Figure- 1 shows atrunk'circuit, the outgoing end of. which iseQuipp'ed with (111-, Iplicate jacks a'ndja polarized relay for de- 'termining which of twoparties onaline isjtobesignaled; and a Fig. 2 shows a cord circuitemployed at V frelay 16 and tripping relay 17, loweralter- 'nate contactof relay l0, alternate contact the originating oflice andequippedwith areversing key for reversing the polarity of the battery connected withthe outgoing end of the trunk circuit. When the reversing key isemployed, the. outgoing end of the trunk circuit may be equipped withonly one jacka y 3.-

Throughout the various figures, thesame reference characters will beused to designate the same pieces of apparatus.

In=Fig. 1 thereis shown a trunk circuit.

A extending between a first and a second Specification of LettersPatent.

Patented July 9, 1918.

, Application filed December 13, 1916. Serial No. 136,625.

central oflice. A cord circuit B adapted tor connection with theoutgoing end of the trunk circuit A islocated at the first centralotfice; The outgoing end of the trunk is equipped with duplicate acks 5and 6, the wiring of the tip and ring contacts thereof beingreversed-Associated with the outgoing end of the trunk circuit is a polarizedrelay 7, poled sothat it does not operate whenthe cord circuit B isassociated with thejack 5, but does operate when the plug of the cordcircuit B is associated with the jack 6. A telephone line C terminatesat the second central ofiice. The line C is pro-- vided with twostations D and E, the call bell at station D'being connected between thering side of line and ground and the call bell at station E beingconnected between the tip side of line and ground.

Referring to the operation of the system shown in'Fig. 1, the operatorat the first central oiiice having received an order for connection withstation D on line C which terminatesat the second central office, com-.mumcates with the operator thereat over at the second central .ofiice,observing the lighted condition of la1np.9, inserts the plug of trunkcircuit A. into the jack of line C, whereupon relay of the trunk circuitand cnt-ofl relaylQ of. line C operate. The operation of relay 10 causesthe operation of relay .15 over a circuit frombattery through thewinding of relay 15, normal contacts of is thereby extinguished. Theoperation of relay connects a source of alternating current 20 to thering contact of the plug through; the winding of tripping relay 17left-hand normal contact ofswitching relay minatin'g, atthe secondswitchboard, a. relay in theitrunk. circuit energized upon the con- 7nection thereof with the telephone line, a source of rmging current,a rnging relay responsive to theenergization of; the first relay to connectthe; source of current to the telephone line, a linkcircuit at the firstswitchboard, means controlled by the connectionof the link circuitwiththe trunk circuit .for determining the side oi tl1e line over whichringing- .current to proj ected, athird relay in the trunk c rcu1tcontrolled, over. the connected telephone he, a

signaling device inthe trunk circuit, interrupter mechanism, and anoperatlng circuit ar -,lenergized,

5 A telephne exchange system comprising a truiik circuit ex'tending froma first to a .second,switchboard, a telephonehne termin atlng, atthefs'econd switchboard, a relay in thetrunkcircuit"energized upon the0on5 nectionthereoit' with the telephone line, a source ofringingcurrent, a ringing relay responsive to the energijzationof thefirst relay; to connect thelsou'rce of ringing current with thetQilGPhQIIGllIIQ, a linkcircult at the first switchboard, apolarize'd'relay in the trunk circuit controlled bythe connection of thelink circuit therewith for determining the slde of the line over wh ch rng ng current is to be projected, a third relay in the trunk.

circuit controlled over the connected tele phone line, a signalingdevice in the trunk ing a trunk circuit extending from a first to asecond central ofiice, a telephone line terminating at the secondcentral oilice and connected with the trunk circuit, a signaling devicein the trunk circuit, a relay in the trunk circuit controlled over thetelephone line, a relay controlled over the trunk circuit from the firstcentral oflice, and means controlled by both relays for causing theintermittent operation of the signaling device.

7. A telephone exchange system comprising a trunk circuit extending froma first to a second central oflice, a telephone line terminating at thesecond central oflice and connected with the trunk circuit, a signalingdevice in the trunk circuit, a relay in the trunk circuit controlledover the telephone line, a second relay in the trunk circuitcontrolledover the trunk circuit from the first central office, and an interrupterbrought into. circuit relation with the signaling device upon thedee'nergization of the second relay while the first relay is energized,thereby causing the intermittent operation of the signaling device.

8. A telephone exchange system comprising a trunk circuit extending froma first to a second switchboard, a link circuit at the firstswitchboard,a signaling device in the trunk circuit operated upon the connectionofthe link circuit therewith, a telephone line terminating at the secondswitchboard and connectedlwith the trunk circuit, and means responsiveto the disconnection of the link 'cir cuit from the trunk circuit tocause the intermittent operation of the signaling device. c

"9, A" telephone exchange system comprising atrunk circuit extendingfrom a first to a second switchboard, a link circuit at the first,switchboard, a relay in the trunk circuit energized uponthe connectionof the link circuit therewith, a signaling device in the trunkcircuitoperated upon the energization-of the relay, a telephone linetermihating at: the second switchboard, means in theytrunk circuitresponsive to the connection thereof with the telephone line .to stopthe operation of the signaling device, and means rendered effective uponthe deenergization of the relay when the link circuit is disconnectedfrom the trunk circuit to cause the intermittent operation of thesignaling device. V

.10. .A telephone exchange system comprising a trunk circuit extendingfrom a first to a second switchboard, a link circuit at the firstswitchboard, a signaling device in the trunk circuit operated upon theconnection of the link circuit therewith, a telephone line terminatingat the second switchboard, a relay in the trunk circuit responsive tothe connection thereof with the telephone line for stopping theoperation of the sig lished upon the subsequent disconnection of thelink circuit from the trunk circuit thereby causing the intermittentoperation of the signaling device.

11. A telephone exchange system comprising a trunk circuit extendingfrom a first to a second switchboard, a link circuit at the firstswitchboard, a relay in the trunk circuit energized upon connection ofthe link circuit therewith, a signaling device in the trunk circuitoperated upon the energization of the relay, a telephone lineterminating at the second switchboard, means in the trunk circuitresponsive to the connection thereof with the telephone line forstopping the operation of the signaling device, a relay in the trunkcircuit controlled over the telephone line, and an intermittentoperating circuit for the signaling device established upon thesubsequent deenergizw tion of the first relay While the second isenergized. 1

12. A telephone exchange system comprising a trunk circuit extendingfrom a first to a second switchboard, a link circuit at the firstswitchboard, a relay in the tin-11 k eircult energized upon connectionof the link circuit therewith, a signali-i-"rg 'clevi'ce in *theu-un'kei-i-cui t operated upon the energization of the relay, atelephone line terminating at the "second switchboard, means in the linkcircuit responsive to the connection ther'eoi with the telephone linefor stopping the"0156i?ation of the signalingdevice, a re lay in "thetiunl': 'eir'cuit controlled over the telephone line, interruptermechanism, -a nel a circuit including theinterr'u pter -'1nechanisin andthe signaling device established through en a ed =eonta'c'ts of theehove tWo relays upon the deenergization of the first While the secondl'senergized.

13. A tel'eplhone exchange system com-- prising a trunk-circ'uit"eXtenclin',Q "from a first to a secondswitchboard, a linkcircuit at thefirst s w1teh'boarcl, a rela-y in the trunlk gi'zlttion ofthe i'elaiy a telephone -line terminating I at the seconcl switchboard,a relay :in the trunk elr'euit responsive to the -eonnee- Copies of thispatent may be obtained for tioh thereof with the telephone line forstepping the operation "of the signaling (le vice/5e third rel-avin-the-t-run k "QT-01111376011- troll-eel ever the telephone line, andan intering a trunk circuit extenl in'g from a first i to a seconds'Wi-tchhoarch a l in'k c 'i-rcu'it at the first s-Witchboarl, a'relay'in the trunk H circuit energizeel upon the connection of'the 11'n'kcircuit "therewith, a signaling device in the trunk circuit operatedupon the elne-r I g zatron of the relay, a telephonehne ter minat'i'ngat the second switchboard, a'relay' in the trunk "circuit responsive tothe con nee'ti'on thereof With the telephone linefifor stopping theoperation of the signal ing 'de vice, a thirrl relay in the trunkeireuiit eon- V trdlledfover the telephone jlnie, interrupter mechanism,and an operating cireuit'forthe signzfiling clev iee' and theinterrupter mechanisin including engaged contacts of'th'e three relaysestablish'e'l upon the subsequent deg energization of the firstrela-ywhilethe second and'thirclare energizel. I 1

In witness whereof, I hereunto "subscribe FH'ENRY P. :CLAUSEN,

myinamethisfourthda? of December A. 1),,

